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g Stubaital tant .g'atmdftm ai Massa-sew T. S. SMITH, OF CHARLESTOWN, ASSIGNOR -TO ALFREDVHAELY, OF

' NEWTON, MASSACHUSETTS.

Letters .Patent No. 84,515, dated December 1, 1868.

MRO'VEMIENT IN' LET-OFF MECHANISM FOR LOOMS.

The Schedule referred to in these Letters Pa'tent and maldng part of the lame.

frame.

A A represents the frameof a loom.

B, the yarn-beam, and

C, the cloth-beam.

D is the whip-roll, and

E, the lay.

F isrthe crank-shaft, and

G, straps connecting it with the lay.

f is a gear-wheel upon the yarn-beam, meshing into a gear-pinion, I, upon a smooth surface-wheel or escapement, g, revolving upon a bearing attached to the frame, and having its axis projecting outside at n, with asmall crank, for the purpose of easily Winding up any slack .of the yarn upon the beam. j f

The whip-roll rod D is supported, at its ends, in studs or rods d d, which pass down through double brackets a a, attached to the frame at each end.

Between the shelves of the brackets a a, and around the rods d, are placed spiral springs c, and a collar, b,

with a set-screw, e. The lower end of the spring c rests upon the lower shelf, a, and the upper end presses against the collar b, which is movable upon d, and can be adjusted to any height, and so adjust the pressure of thespring by the set-screw e.

J j is a double-armed lever, pivoted to the frame at k, the'lower arm, J being curved, and made to act as a brake upon the periphery of the wheel g.

L l is another lever, pivoted to the frame at 2, the short arm, l, acting upon lthe under side of the arm j of the lever J j.

H is a projecting lug or finger upon the crank-shaft F, having a set-screw, N, to adjust its position upon the shaft circumferentially, and also having an adjust- -able plate, h, with set-screw i, to regulate the length of its stroke or reach; this nger H, in its revolution, striking upon the arm L of the lever L l.

K is a spiral spring, which may be made adjustable as to its tension and power, having one end fastened to the brake-lever J at 3, and the'other to the frame at 4.

In the revolution of the crank-shaft, the inger'H strikes upon the lever-arm L, and raises the lever-arm j, and thus raises the brake J from the wheel or escapement g, and allows the delivery of so' much yarn as may be needed from the yarn-beam. As soon as the nger H has passed by the lever-arm L, the spring K brings back the brake J upon the escapement-wheel g, and stops the delivery of the yarn.

H being made adjustable upon F by set-screw N, can be made to operate upon the brake at any position of the lay that may be desired; and h being made adjustable, so as to lengthen the reach of H, the brake may be lifted for a longer or shorter period, as desired.

Instead of J acting merely as a friction-brake, the periphery of g may he supplied with lugs, yagainst which J may strike, and from which it may be relieved; and instead of using an intermediate lever, the nger H may b e made to strike directly upon one of the lei erarms of J, and relieve the brake from the escapement.

The advantage of this method is thefurnishing of a positive let-off, and one not affected by any casual pressure upon the whip-roll. It can also be made-perfectly adjustable and controllable.

The whip-roll being suspended upon springs, is elastic under the pressure of the yarn. It can be varied in position' as to the yarn-beam, and the amount of elasticity or tension can be readily varied and adjusted as desired. i i

Where the positive let-oii` is not desired, and the letting 'oii' is to be done by the pull or tension of the yarn, M mi is a lever, pivoted to the frame at 1, one end being. acted upon bythe rod d, and the other end acting upon the lever-arm j, and thus raising the brake from the escapement, and lett-ing oi' the yarn by the.

pressure of the yarn upon the whip-roll. This may also be done by the action of the rod d upon the leverbrake without any intermediate lever.

Where the positive let-01T is alone to be used, thel lever M m is to be dispensed with.

Where the let-off is to be accomplished by the ten-u sion of' the yarn, the lever L-l is to be dispensed with. What I claim, and desire to secure by Letters Patent, is

1. The combination of the brake or pawl J with the shaft and finger H, when the parts are constructed and arranged to operate together, substantially as described. 2. The adjustable lug or finger H h, when arranged and operating in connection .with the brake or pawl J,

as a positive let-o` to the yarn, substantially in the manner described.

3. The whip-roll D, supported by sliding arms d, in combination with the spring c and adjustable collar b,

constructed and arranged substantially as and for' the' purposes described.-

4. The whip-roll supported in spring-bearings, in combination, and arranged and operating in connection, with the brake or pawl J, so as to relieve the same,

and let oii the yarn by means of the tension thereof,

substantially as described. i

5. The whip-roll, supported in spring-bearings, in

combination or connection with the shaft and iin ger H, when the latter are arranged to operate with the pawl or brake J, substantially as described.

1n testimony whereof,I have hereunto subscribed my name.

A T. S. SMITH. Witnesses:

FRANCIS L. HAYES, WM. H. Kurkm.. v 

